Your question is Lua-Centric System Design. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a system that requires a central node, supports Lua scripts, and avoids single point of failure (discussing master-slave replication/failover). Asked in the Phone Screen stage. System design round focusing on central management nodes, failure handling, and architecture design similar to what the team works on. Reported follow-up: How to avoid a single point of failure?